| Fan CFM???? [message #115514] |
Fri, 18 February 2011 12:04  |
g.winger
Messages: 792
Registered: February 2008
Location: Warrenton,Missouri
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Any body know the CFM rating of a 78 AC fan??? Brought fan to work. Took it to the vibration MW and Elec. Put a dot on the cage. Thought it was 1355rpm. But that seemed kinda fast. Used a "strobe" type tach. Problem was we put the dot on the outsde. So if it blinked twice as fast you can't see the second image when its on the other side. Put the dot on the inside face and that works better. So,,,,674 rpm x 5.25 dia.= 21.64" or 14,607" per min. 1217.25ft. per min. 73,035 ft. per hour.= 13.83mph,,,,,does this sound correct??? 675rpm,,,,,5.25 inch dia. Now I don't remember the area of the fan discharge. But whats the formula for mph of air thru a ??? size hole???,,, If you'r wondering why??? Stonger motor, more cfm could equal more air,,,better AC/Heat,,thanks,,,,,,PL
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